Broken German links HELP REQUESTED

[eshellman]

Below is a list of failing links in our German lists
You can help improve this repo by resolving the problems.

A failing link may be a website or resource that has disappeared. You can submit a PR

• removing the link (maybe the resource is obsolete.)
• correcting the link (sometimes things move)
• replacing the link (make sure the link is authorized, or the resource is open-licensed). Often a link to internet archive's wayback machine is useful.

Sometimes a link is only temporarily failing, or the site blocks link-checkers. If that's the case, leave a note on this issue.

In your PR, reference this issue.

Thanks for your help!

free-programming-books-de.md

• 500 Can't connect to www.asc.tuwien.ac.at:443 (certificate verify failed) http://www.asc.tuwien.ac.at/~eprog/download/schmaranz.pdf
• 500 Can't connect to www.buech-gifhorn.de:80 (Name or service not known) http://www.buech-gifhorn.de/scilab/Einfuehrung.pdf